RTF malware analysis — malicious · 5814a2242d83959a

MALICIOUS

RTF

110.9 KB First seen: 2019-03-18

MD5: 25378a21c0ae0850c7eb53337f9b51bf SHA-1: f8a0654ef62e7ba76e29d94a2bdf2e04527c3a24 SHA-256: 5814a2242d83959aadfc451d2e6e19e3225f83d9dc3ebf0817e9310255a85bdb

262 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains OLE object data and triggers CVE-2017-8570, which is known to drop SCT scripts. The embedded URL http://test1.ru/newbuild/tiii.php?stats=send&thread=0 likely serves as a download location for a second-stage payload. The exploitation of this vulnerability facilitates client execution, leading to potential further compromise.

Heuristics 8

Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570

RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
INCLUDETEXT/INCLUDEPICTURE remote URL high RTF_INCLUDE_REMOTE

RTF document uses INCLUDETEXT or INCLUDEPICTURE with an http:// URL — Word can fetch the remote content on open depending on Office version and external-content settings, enabling remote template injection, NTLM capture via redirects, or payload delivery
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
OLE object data medium RTF_OBJDATA

RTF contains 5 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://test1.ru/newbuild/tiii.php?stats=send&thread=0 In RTF body

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00018655.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x18655	395 bytes
SHA-256: `015022d806f7952194d066c426f250c9954202207f63c3dcba9c262268726ef2`
`objdata_01_off000189a3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x189A3	348 bytes
SHA-256: `5f5805e3d755f47386fad42dc55d5dc5051b44bd7019ab3df06f4ffc91bb22fe`
`objdata_02_off00018c9c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x18C9C	2488 bytes
SHA-256: `c09f6dd977d737f4b115a76fd15e8ae2290d82be2dda02472d0938548dbb3fca`
`objdata_03_off0001a044.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1A044	726 bytes
SHA-256: `791c02b116348729dff2c987ab9af6a71b6fcbef161728546e9a937382dcece3`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell")
`objdata_04_off0001a632.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1A632	2633 bytes
SHA-256: `1b11531569c98284e74e6ae4c14275a0ab013edb5d6151ea140c1c38c40ac41e`

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